Innovative technology used in sewer renewal project

Interflow’s innovative technology has been utilised in the relining of a severely damaged sewer.

Interflow recently completed a
sewer renewal project for Coliban Water, located
along View Street in Bendigo’s CBD which is subject to high volumes of
pedestrian traffic.

On initial inspection, the extent of the existing
damage meant that a large section of the sewer required replacing via open
trenching prior to relining.

Any excavation to the site would undermine the integrity
of the support columns of a nearby heritage listed balcony structure, meaning significant
structural support was required at considerable cost.

To remain economical, a temporary propping system
was designed to ensure there was no risk of foundation movement or settlement
of the site during and after works.

As an overall solution, the damaged section of the
pipe was repaired and the sewer relining was completed by using SPR™ EX – Expanda spiral wound liner that did not
impose any risk to the support structure of the nearby balcony.

Interflow used stabilised sand for
backfill material to ensure there was no subsidence post-completion, as well as
a vacuum truck for hydro excavation due to the vicinity’s existing underground services
and the restricted space available.

The work was completed without incident
and within a week, which is significantly faster than using a dig-lay-backfill
method.